Ripping head



1,634,74 July 1927 A. J. JOHNSON ET AL 9 RIPPING HEAD Filed July 15. 1926 a rit fgl gl Patented July 5, 1927.

UNITED STATES PATENT OFFICE.

AKLAS 'J'. JOHNSON, JOSEPH BOILEAU, AND ELMER A. FINDELL, OF MISSOULA,

' MONTANA.

RIPPING HEAD.

Application filed July 13, 1926. Serial No. 122,153.

This invention aims to provide a novel tool for ripping boards, although, with slight changes, the tool might be adapted for crosscutting, the tool, when'used as a ripping instrumentality, being so constructed that it will produce a smooth surface, the tool, in substance, acting both as a ripper and as a plane.

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the invention appertains.

lVith the above and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment. of the invention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention.

In the drawings Figure 1 shows in elevation, a rotorcarrying a plurality of tools, constructed in accordance with the invention, parts being broken away;

Figure 2 is a sectional View wherein the tools appear in side elevation;

Figure 3 is a composite view showing one of the tools used in Figures 1 and 2;

Figure 4 is a composite view showing another of the tools used in Figures -1 and 2;

Figure 5 is a composite View illustrating a modification.

Referring to Figures 1, 2, 3 and 4, there is shown a tool 1 provided in its side with recess 2 defining a thinned bit 3, the end surface 4 of the bit being disposed at an acute angle to the axis of the bit to form a point 5 at the extremity of one edge 6 of the bit, the point 5 being beveled laterally, as shown at 7. In the edge 6, near to the point 5, clearance notch 8 may be formed. The foregoing explanation applies particularly to the tool shown in Figure 3, but it applies, also, to the toolshown in Figure 4, parts hereinbefore described being designated, in Figure 4, by numerals previously used, with the suffix a. In Figure 4, the recess 2* and the bevel 7 are reversed with respect to the correspondin parts in Figure 3, so that the tool shown in Figure 3 may be denominated a left whereas, the tool shown in Figure 4 may be called a right.

Tools constructed as shown in Figures 3 and 4 are mounted in alternating order, circumferentially in and around a rotor 9, which may be of any desired construction.

'The recesses 2 and 2 of adjoining bits, are

disposed, as shown at 10 in Figure 1, toward opposite sides 11 of the rotor 9, adjoining bits being slightly out of line, as shown at 12, with respect to a plane AB at right angles to the axis CD of the rotor, the points 5 and 5 of adjoining bits being disposed on opposite sides of the plane A-B, and the aforesaid bevels 7 and 7 of adjoining bits slanting in opposite directions with respect to said plane A- B.

When the rotor 9 is turned, the tools will not only rip the board, but will plane or smooth off the edges of the severed parts, so

that there is no undesirable roughness.

If desired, recourse may be had to the single tool shown in Figure 5,this tool, however, being less etficient than are the tools shown in Figures 3 and 4 when those tools are used together.

In Figure 5, parts hereinbefore described have been designated by numerals previously used, with the sutfix b. In this form of the invention, the clearance notch 8 is considerably longer than the notch 8 or the notch S and is formed by giving an inclination to the edge 6". The recesses 2 are located on opposite sides of the bit, and run out to nothing, as shown at 14, at'the back edge 15 of the bit. The bevels 7 are on both sides of the point 5".

lVhat is claimed is In a device of the class described, a tool the opposite edge surfaces of which are parallel, the tool being provided in its sides with recesses defining a thinned bit, the end surface of the bit being disposed at an acute angle to form a point at the extremity of one of said edge surfaces of the bit, the corners of the point being bevelled laterally in opposite directions at said edge surface, themOo end surface of the bit being in the form 01 a hexagon, two sides of which, formed by the recesses, are materially longer than the remammg sides;

In testimony that we claimthe foregoing as our own, we have hereto atfixed our sig- 

